Bicycle stem



FIG. 1 is a perspective view of a bicycle stem, showing my new design in which the ends are connected by tube shown in broken lines which form no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a side elevational view thereof, of which the opposite side is a mirror image;

FIG. 5 is a bottom plan thereof; and,

FIG. 6 is a top plan thereof. 

The ornamental design for a bicycle stem, as shown and described. 